期刊
TRANSLATIONAL PSYCHIATRY
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/tp.2016.206
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资金
- Japan Society for the Promotion of Science [25861037, 15K09849]
- Strategic Research Program for Brain Sciences from Japan Agency for Medical Research and development, AMED
- AMED-CREST from Japan Agency for Medical Research and Development, AMED
- Leading Project for Realization of Regenerative Medicine from the Ministry of Education, Culture, Sports, Science and Technology
- Funding Program for World-Leading Innovative R&D on Science and Technology
- RIKEN Brain Science Institute Fund
- NHMRC Fellowship [APP1002240]
- Grants-in-Aid for Scientific Research [25861037, 15H04278, 15K09849, 16K07247] Funding Source: KAKEN
Given the complexity and heterogeneity of the genomic architecture underlying schizophrenia, molecular analyses of these patients with defined and large effect-size genomic defects could provide valuable clues. We established human-induced pluripotent stem cells from two schizophrenia patients with the 22q11.2 deletion (two cell lines from each subject, total of four cell lines) and three controls (total of four cell lines). Neurosphere size, neural differentiation efficiency, neurite outgrowth, cellular migration and the neurogenic-to-gliogenic competence ratio were significantly reduced in patient-derived cells. As an underlying mechanism, we focused on the role of DGCR8, a key gene for microRNA (miRNA) processing and mapped in the deleted region. In mice, Dgcr8 hetero-knockout is known to show a similar phenotype of reduced neurosphere size (Ouchi et al., 2013). The miRNA profiling detected reduced expression levels of miRNAs belonging to miR-17/92 cluster and miR-106a/b in the patient-derived neurospheres. Those miRNAs are reported to target p38a, and conformingly the levels of p38a were upregulated in the patientderived cells. p38a is known to drive gliogenic differentiation. The inhibition of p38 activity by SB203580 in patient-derived neurospheres partially restored neurogenic competence. Furthermore, we detected elevated expression of GFAP, a gliogenic (astrocyte) marker, in postmortem brains from schizophrenia patients without the 22q11.2 deletion, whereas inflammation markers (IL1B and IL6) remained unchanged. In contrast, a neuronal marker, MAP2 expressions were decreased in schizophrenia brains. These results suggest that a dysregulated balance of neurogenic-to-gliogenic competence may underlie neurodevelopmental disorders such as schizophrenia.
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